1 in 3 UK bathrooms has visible mould. Another 40% have hidden mould in walls and ceilings. Your extractor fan runs for 3 minutes after you switch off the light and calls it done. It's not done. Not even close.
Building regs say you need an extractor fan. They don't say how long it should run. Most fans are on a timer switch — 3 minutes after the light goes off. That's not ventilation. That's wishful thinking.
Mould spores start colonising within 48 hours of sustained humidity above 70%. Once established, bleach removes the stain — not the colony. It grows back through the paint.
Your fan runs for 3 minutes after you hit the switch. A hot shower raises bathroom humidity to 90%+. It takes 45-90 minutes to return to baseline. Your fan quits 42 minutes too early.
Opening a window in January drops the room to 4°C. The humidity condenses on cold walls instantly — making the problem worse. You need extraction, not drafts.
Budget extractor fans hum at 45-55 dB — equivalent to a dishwasher cycle. So people don't turn them on. A fan that's off is worse than no fan at all.
Chronic humidity doesn't just cause mould — it rots joists, delaminates plasterboard, and rusts metal fixings. £1,200 in mould removal is cheap compared to £8,000 in structural repair.
Mould spores trigger asthma, rhinitis, and chronic cough. The WHO classifies damp indoor environments as a Grade A health risk. Your family breathes this air 8 hours a night.
The Smart Bathroom Ventilation System doesn't guess. It reads humidity in real time, runs until the air is dry, stays silent enough to forget, and pulls in makeup air so the extraction actually works. Zero user input required.
Precision sensor detects humidity rise within 5 seconds of shower start. Fan activates automatically at 65% RH threshold. No switches. No timers. No remembering.
Most fans quit after a fixed 3-minute timer regardless of actual humidity. Ours runs until relative humidity drops below 55% — whether that takes 20 minutes or 90 minutes. Then it stops.
18-22 dB at cruising speed — quieter than a whisper. No one skips ventilation because of noise when they can't hear it. Includes boost mode at 32 dB for heavy steam.
Extraction only works if replacement air can enter. Our system includes a passive makeup air vent or optional active inlet — balanced airflow means the fan actually extracts, not just spins.
See real-time humidity graphs. Get alerts when post-shower humidity stays high (blocked duct, failing fan). Track 30-day humidity trends. Know your bathroom's health at a glance.
Standard 100mm / 4-inch ducting. Fits existing ceiling or wall cutouts. Wired to permanent live — no pull-cord, no light-switch dependency. Any electrician can install it in under 2 hours.
The system replaces your existing extractor fan in the same mounting hole. Then it runs itself. Forever. Here's what happens every time someone showers.
Humidity sensor detects the spike within 5 seconds of shower activation. Temperature and VOC sensors confirm it's a shower, not a weather change. Fan spins up to cruise speed.
Fan runs at silent cruise speed (22 dB). Makeup air vent opens passively. Moist air exits through the duct. Dry air enters through the inlet. Continuous balanced flow.
After the shower ends, humidity peaks at ~90%. The fan doesn't stop. It continues extracting for 45-90 minutes until RH returns to baseline (55%). No timer. No guesswork.
When RH hits 55%, the fan stops. Completely. No trickle. No standby hum. The makeup air vent closes. The bathroom returns to passive state — until the next shower.
Background humidity is tracked 24/7. If ambient RH creeps above 60% (leaking pipe, rising damp), you get an app alert. Problems caught before they become repairs.
Most bathroom problems take years to appear. The Smart Ventilation System prevents them in days.
Pre-configured unit ships with sensor, fan, makeup vent, mounting kit. 100mm duct compatible.
Any electrician swaps your existing fan. 90-minute job. Permanent live wiring — no switches needed.
System learns your bathroom's humidity profile. Establishes baseline. First shower triggers auto-extraction.
App confirms humidity never exceeds 65% post-shower. Zero condensation on walls. Zero mould growth conditions.
The highest compliment: you forget it exists. No mould. No smells. No thinking about ventilation. It just works.
630,000 bathroom renovations annually in the UK. Every one needs ventilation. Most get a £30 timer fan. The upgrade path is £149 — and the alternative is £1,200 in mould remediation.
| Metric | Year 1 | Year 2 | Year 3 |
|---|---|---|---|
| Units Sold | 3,000 | 12,000 | 45,000 |
| Avg Unit Price | £149 | £149 | £139 |
| Hardware Revenue | £447,000 | £1,788,000 | £6,255,000 |
| Installer Referral Fees | £45,000 | £180,000 | £675,000 |
| Total Revenue | £492,000 | £1,968,000 | £6,930,000 |
| COGS + Operations | £360,000 | £960,000 | £3,150,000 |
| Net | £132,000 | £1,008,000 | £3,780,000 |
Almost never. The unit fits standard 100mm / 4-inch ducting. If your current fan uses this diameter, it's a straight swap. If you have 150mm ducting, a reducer adapter is included.
The unit defaults to a safe mode: runs for 60 minutes after any humidity detection, then checks the sensor again. If the sensor remains unresponsive, the app alerts you. The bathroom stays ventilated — just not as efficiently.
Neither. PIV (Positive Input Ventilation) units push air into a house from the loft — they're whole-house and cost £800-£2,000 installed. Dehumidifiers collect moisture in a tank you have to empty. This is a direct extractor fan replacement — same form factor, intelligent operation. £149. One room. Done.
If you're comfortable replacing a light fitting, you can install this. It's permanent-live wiring (brown + blue + earth) and two screws into the ceiling. However, bathroom electrics are notifiable work under Part P in England and Wales — we recommend a qualified electrician.
Treat the mould first (HG Mould Spray or specialist remediation). Then install the fan. The fan prevents recurrence — it doesn't remove existing colonies. Order of operations: kill the mould, fix the ventilation, paint with anti-mould additive.
A £30 fan runs for 3 minutes after the light goes off, regardless of humidity. It's loud. It has no sensor. It has no makeup air. It's a noise machine that pretends to ventilate. This is a sensor-driven system that runs until the job is actually done. The difference is the difference between ventilation and the appearance of ventilation.
Mould isn't a cleaning problem. It's a ventilation problem. Fix the cause once — with a fan that actually knows when to run and when to stop.